Neutron stars, as the name suggests, are mostly made of neutrons. But the cores of these tiny, dense stellar leftovers might conceal new states of matter, including strange matter. The light from these stars holds the key.
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Miller, C. Twinkle, twinkle, neutron star. Nature 420, 31–33 (2002). https://doi.org/10.1038/420031a
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DOI: https://doi.org/10.1038/420031a
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